Description:
When I try to export as a PDF to the Desktop, I get an error that states:
"Error saving the document Untitled 1:
General Error.
General input/output error."

I'm running Kubuntu 18.04LTS using the apt version of libreoffice (6.0.7.3) (not any weird PPA). However, I tried using the snap version of libreoffice as well, and it had the same isssue.

When I run libreoffice from terminal and try to export a PDF, I get this error on the command line: 
(soffice:27574): GLib-GIO-WARNING **: 16:32:09.192: Error creating IO channel for /proc/self/mountinfo: Permission denied (g-file-error-quark, 2)

And:

LibreOffice(23326): couldn't create slave: "Unable to create io-slave:
klauncher said: Unknown protocol ''.
"  
LibreOffice(23326): couldn't create slave: "Unable to create io-slave:
klauncher said: Unknown protocol ''.
"

I've tried purges using apt purge and deleted the ~/.config/libreoffice folder. I also tried the snap version. Both have the same error.

The file permissions for the Desktop are: drwxr-xr-x 1 sarah sarah 1982 Mar 26 11:51 Desktop/

Steps to Reproduce:
1. Start new libreoffice instance from KDE's launcher menu
2. Choose new writer doc
3. Type F to pay respects to PDF writer
4. Choose file -> export as PDF
5. Choose to save to desktop
6. Get error

Actual Results:
I get the error prompt box that says:

Error saving the document Untitled 1:
General Error.
General input/output error.

on the screen and no PDF is created.

Expected Results:
PDF should be made without error


Reproducible: Always


User Profile Reset: Yes



Additional Info:
Hardware Specs:

sarah@LesserArk:~$ inxi -Fx
System:    Host: LesserArk Kernel: 5.3.0-42-generic x86_64 bits: 64 gcc: 7.4.0
           Desktop: KDE Plasma 5.12.9 (Qt 5.9.5) Distro: Ubuntu 18.04.4 LTS                                                                       
Machine:   Device: laptop System: Hewlett-Packard product: HP ENVY 17 Notebook PC v: 097E110000405E00000620100 serial: N/A                        
           Mobo: Hewlett-Packard model: 1968 v: KBC Version 93.52 serial: N/A                                                                     
           UEFI: Insyde v: F.70 date: 10/20/2017                                                                                                  
Battery    BAT0: charge: 41.6 Wh 100.0% condition: 41.6/41.6 Wh (100%)                                                                            
           model: Hewlett-Packard Primary status: Full                                                                                            
CPU:       Quad core Intel Core i7-4702MQ (-MT-MCP-) arch: Haswell rev.3 cache: 6144 KB                                                           
           flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx) bmips: 17558                                                                      
           clock speeds: max: 3200 MHz 1: 2178 MHz 2: 1374 MHz 3: 1733 MHz 4: 1633 MHz 5: 1913 MHz 6: 1344 MHz
           7: 2159 MHz 8: 1685 MHz
Graphics:  Card-1: Intel 4th Gen Core Processor Integrated Graphics Controller bus-ID: 00:02.0
           Card-2: NVIDIA GK107M [GeForce GT 750M] bus-ID: 01:00.0
           Display Server: x11 (X.Org 1.20.5 ) drivers: modesetting,nvidia (unloaded: fbdev,vesa,nouveau)
           Resolution: 1920x1080@60.04hz, 1920x1080@74.97hz
           OpenGL: renderer: GeForce GT 750M/PCIe/SSE2 version: 4.6.0 NVIDIA 390.116 Direct Render: Yes
Audio:     Card-1 Intel 8 Series/C220 Series High Definition Audio Controller
           driver: snd_hda_intel bus-ID: 00:1b.0
           Card-2 Intel Xeon E3-1200 v3/4th Gen Core Processor HD Audio Controller
           driver: snd_hda_intel bus-ID: 00:03.0
           Sound: Advanced Linux Sound Architecture v: k5.3.0-42-generic
Network:   Card-1: Intel Wireless 7260 driver: iwlwifi bus-ID: 07:00.0
           IF: wlp7s0 state: up mac: e4:70:b8:f8:99:b8
           Card-2: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
           driver: r8169 port: 3000 bus-ID: 0f:00.0
           IF: eno1 state: up speed: 1000 Mbps duplex: full mac: a0:1d:48:fa:67:c0
Drives:    HDD Total Size: 3550.8GB (68.0% used)
           ID-1: /dev/sda model: TOSHIBA_MQ01ABD1 size: 1000.2GB
           ID-2: /dev/sdb model: LITEONIT_LMS size: 24.0GB
           ID-3: /dev/sdc model: ST2000LM015 size: 2000.4GB
           ID-4: /dev/sdd model: Samsung_SSD_860 size: 500.1GB
           ID-5: /dev/mmcblk0 model: N/A size: 2.0GB
           ID-6: USB /dev/sde model: Gaming_Xbox_360 size: 8.0GB
           ID-7: USB /dev/sdf model: TransMemory size: 16.0GB
           ID-8: USB /dev/sdg model: U3_Cruzer_Micro size: 2.0GB
Partition: ID-1: / size: 399G used: 323G (82%) fs: btrfs dev: /dev/sdd2
           ID-2: /home size: 399G used: 323G (82%) fs: btrfs dev: /dev/sdd2
           ID-3: swap-1 size: 16.00GB used: 0.00GB (0%) fs: swap dev: /dev/sdd3
RAID:      No RAID devices: /proc/mdstat, md_mod kernel module present
Sensors:   System Temperatures: cpu: 61.0C mobo: N/A gpu: 0.0:54C
           Fan Speeds (in rpm): cpu: N/A
Info:      Processes: 499 Uptime: 1:00 Memory: 9384.9/15945.4MB Init: systemd runlevel: 5 Gcc sys: 7.5.0
           Client: Shell (bash 4.4.201) inxi: 2.3.56